High Capacity Nylon Plastic Wall Expansion Screw Anchor Heavy Curtain Rail Concrete Mounting Fastener Product Description The High Capacity Nylon Plastic Wall Expansion Screw Anchor is a maximum-capacity fastening solution designed for heavy curtain rails, theater drapery tracks, large roller blind systems, and heavy-duty wall-mounted fixtures on solid concrete and masonry surfaces. Each complete set contains a 12mm diameter PA6 nylon expansion plug pre-matched with an M10 x